Online dissolved oxygen meter

GWQ-DO Series Dissolved Oxygen Meter | GAIMC

Product Overview

The GWQ-DO series dissolved oxygen meter is an intelligent online chemical analysis instrument, including two models: GWQ-DO280 (Membrane polarography) and GWQ-DO290 (Fluorescence method). It is widely used in continuous monitoring of dissolved oxygen (DO), saturation, oxygen partial pressure (OPP) and temperature in solutions of thermal power, chemical fertilizer, metallurgy, environmental protection, pharmaceutical, biochemical, food and tap water industries.

The monitoring data can be remotely transmitted, monitored and recorded by connecting to a recorder through the transmission output. It is also equipped with an isolated RS485 interface, which can be easily connected to a computer for data monitoring and recording via MODBUS-RTU protocol, meeting the diversified monitoring needs of industrial sites.

GWQ-DO Series Dissolved Oxygen Meter Controller

GWQ-DO Online Monitoring Application Scene

Key Features

📊

Multi-parameter Monitoring

Supports DO, saturation, OPP measurement (GWQ-DO280), temperature detection, upper/lower limit control and transmission output.

🛡️

Isolated Output & Communication

Isolated 4-20mA transmission output and RS485 communication, effectively reducing external interference for stable data.

🌡️

Configurable Temperature Compensation

Supports manual and automatic temperature compensation, adapting to different temperature environments for accurate measurement.

⚠️

Dual Alarm & Hysteresis Setting

High and low alarm function with adjustable hysteresis, real-time early warning for abnormal water quality.

🌐

Bilingual Switch Support

Supports Chinese and English language switching, convenient for international users to operate.

🔧

Zero & Full Scale Calibration

Supports zero oxygen and full scale calibration, ensuring long-term measurement accuracy of the instrument.

Technical Specifications

Item	GWQ-DO280	GWQ-DO290
Measuring principle	Membrane (polarography)	Fluorescence method
Screen size	2.8 inch (128*64)
Measuring range	Oxygen content: 0~20mg/L; Saturation: 0~200%; Oxygen partial pressure: 0~400hPa	Oxygen content: 0~20mg/L; Saturation: 0~200%
Accuracy	±1.5%FS	±3%FS
Resolution	Oxygen content: 0.01mg/L; Saturation: 0.1%; Oxygen partial pressure: 1hPa	Oxygen content: 0.01mg/L; Saturation: 0.1%
Repeatability	±0.5%FS
Temperature measurement range	-10 ~ +60℃	0 ~ 45℃
Resolution (temperature)	0.1℃
Correction accuracy (temperature)	±0.5℃
Temperature measurement type	Manual/Auto (NTC10K / PT1000)
Power supply	AC220V±10% , 50Hz/60Hz
Relay alarm	250VAC/3A
Communication	RS485 (compatible with MODBUS RTU)
Transmitting function	Isolated transmission 4-20mA output, maximum loop 750Ω, 0.1%FS
Dimensions (mm)	100100150
Opening size (mm)	92.5*92.5
Language selection	Chinese and English switching
Supporting electrode	GEC-DO2801	GEC-DO2901 (fresh water); GEC-DO2902 (sea water)
Cable length	Standard 10m (cable length ≤ 30m)

Installation Methods

🧱

Side Wall Installation

Install the electrode on the side wall of the container for stable measurement.

🏗️

Top Flange Installation

Flange-mounted from the top, suitable for deep container applications.

🌀

Pipe Bend Installation (Type C)

Install at pipe bends for continuous flow water quality monitoring.

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Pipe Bend Installation (Type D)

Alternative pipe bend mounting option for flexible site adaptation.

💧

Flow-through Installation

Flow-through design for precise measurement of circulating water.

🌊

Submerged Installation

Submerge the electrode directly in water for in-situ monitoring.

Core Applications

⚡

Thermal Power

DO & temperature monitoring in power plant water treatment systems.

🧪

Chemical & Fertilizer

Real-time DO monitoring of chemical solutions in production processes.

🚰

Water Supply & Treatment

Tap water and sewage dissolved oxygen online detection.

🍜

Food & Pharmaceutical

DO monitoring in food and biochemical pharmaceutical water systems.

FAQ

What models are included in the GWQ-DO series?

The GWQ-DO series includes two models: GWQ-DO280 (adopting Membrane polarography) and GWQ-DO290 (adopting Fluorescence method). The latter is available with GEC-DO2901 (for fresh water) and GEC-DO2902 (for sea water) electrodes.

What communication protocols does the GWQ-DO series support?

It is equipped with an isolated RS485 interface, compatible with MODBUS-RTU protocol, which can be easily connected to computers, recorders and other equipment for remote data monitoring and recording.

What temperature compensation functions does it have?

The instrument supports configurable temperature compensation, including manual and automatic modes, and is compatible with NTC10K / PT1000 temperature sensors to ensure measurement accuracy under different temperature conditions.

What is the standard cable length of the supporting electrode?

The standard cable length of the supporting electrode is 10m, and the maximum allowable cable length is not more than 30m, which can meet the installation needs of most industrial sites.

Industrial Online Dissolved Oxygen Monitoring Solution

GWQ-DO series dissolved oxygen meter supports multi-parameter monitoring, isolated output, bilingual switching and multiple installation methods.
Choose Membrane polarography or Fluorescence method models according to your industrial water quality monitoring needs.

Get Custom Solution

Online Message

Have questions? Need a quote? We are ready to help! Fill out the form and a member of our sales team will contact you to discuss your requirements. You can also give us a call at (86)177-9158-1665.

GWQ-DO

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HOT KEYWORDS

GWQ-DO Series Dissolved Oxygen Meter GWQ-DO280 GWQ-DO290 0~20mg/L DO Range ±1.5%FS (DO280) ±3%FS (DO290) 2.8inch LCD (128*64) AC220V Power 10m Standard Cable 4-20mA Isolated Output RS485 (Modbus RTU) Manual/Auto Temp Comp CN&EN Bilingual Zero/Full Scale Calibration Dual Alarm & Hysteresis Side Wall Installation Top Flange Installation Pipe Bend Installation Flow-through Installation GEC-DO2801 GEC-DO2901 (Fresh Water) GEC-DO2902 (Sea Water)

GWQ-DO